hs-headline

hs-headline is a variable defined in `hideshow.el'.
Its value is

nil

Documentation:
Text of the line where a hidden block begins, set during isearch.
You can display this in the mode line by adding the symbol `hs-headline'
to the variable `mode-line-format'. For example,

(unless (memq 'hs-headline mode-line-format)
(setq mode-line-format
(append '("-" hs-headline) mode-line-format)))

Note that `mode-line-format' is buffer-local.